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SEGMENTS OF BUSINESS - Assets And Capital Expenditure (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
SEGMENTS OF BUSINESS
Assets	$ 409,461	$ 579,730	$ 369,120	$ 589,780
Capital Expenditures	44,277	39,606
Operating Segment | Electric Operations
SEGMENTS OF BUSINESS
Assets	233,865	217,826	220,477	208,331
Capital Expenditures	25,369	16,121
Operating Segment | Coal Operations
SEGMENTS OF BUSINESS
Assets	153,514	357,913	144,519	376,387
Capital Expenditures	18,908	23,002
Corporate and Other and Eliminations
SEGMENTS OF BUSINESS
Assets	$ 22,082	3,991	$ 4,124	$ 5,062
Capital Expenditures		$ 483

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